That's the same thing a casters have to do. Do I use my slot on owls wisdom, or save it for a fight?But at low-mid levels, where the game is mostly played, rage is just too integral to the class to be wasting it on a skill check.
Sure, at higher level, they can afford it. But at low level when my slots are tight?
I don't have any issues with the barbarians having utility rages.